Ten months after the operation, the patient attended a control visit to evaluate healing. Sinus tract had appeared one month earlier and the patient had symptoms. The control radiograph showed reduction in lesion size, but the gutta-percha point in the fistulograph pointed to the root apex of tooth 34. The patient was given klindamycin after a bacteriological sample growing Streptococcus oralis. Two weeks later the sinus tract was still open and a decision was made on surgical retreatment.

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